Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thanh ve » hanh ve, thanh va, thanh vien
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
cua tre » cua te, cuu tre, cua triet
xuc va » tuc va, luc va, xac va
cua tu » cua tuc, cua su, cua cu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang xa hoi. hieu van cam ((xuc va) or (duc va)) thanh ve ((cua tre) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu van cam ((xuc va) OR (duc va)) thanh ve ((cua tre) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu van cam ((xuc va) or (duc va)) thanh ve ((cua tre) or (cua tu))*.